12 Pack of Mead Press-it Seal-it #10 Security Envelopes 4.125 in X 9.5 in, White, 45 Count (540 Count In Total) ( 75026) Envelope_Size - 4 1/8 x 9 1/6 Envelope/mailer_Type - Business/Trade Closure - Self-Adhesive Trade_Size - 10